VETERAN horror-movie hottie Debbie Rochon is offering fans the ultimate keepsake – pieces of her brain. The raven-haired star of “Chainsaw Cheerleaders” and “Bikini Bloodbath” says that when she recently revealed she’d be having surgery to remove a brain tumor, diehard devotees asked about acquiring it. “At first, I thought it was a joke. But after dozens of requests . . . I decided to give them what they want,” Rochon tells Steppin’ Out’s Chaunce Hayden. “I’ve gotten a lot of weird requests over the years, but this is by far the freakiest and darkest of them all.”